在已进行的碘应力腐蚀的基础上,对Zr-4包壳管进行了碘-氧及镉的试验研究。试样为国产的堆用燃料元件包壳管,该管经620K温度2小时全退火消除微观结构应力,其外径φ15.3mm,长145 mm,壁厚0.4 mm(酸洗后)。样品两端焊以端塞,其一端端塞带有充气堵孔焊焊口(φ0.8 mm小孔及熔焊凸台)。在端塞环形焊缝焊接前, On the basis of the iodine stress corrosion, the experiments of iodine-oxygen and cadmium in Zr-4 cladding tubes were carried out. The sample is a domestically made heap fuel element cladding tube. The tube is completely annealed at 620K for 2 hours to eliminate the microstructure stress. The outer diameter φ15.3mm, length 145mm, wall thickness 0.4mm (after pickling). Both ends of the sample were end-plugged, and one end of the plug was filled with an air-filled plug hole (Φ0.8 mm hole and a soldering boss). Before the end ring ring weld welding,